Improvement in hollow augers



UNITED STATES Erice@ PATENT ARGALOUS WYCKOFF, OF ELMIRA, NEW YORK.

IMPROVEMENT IN HOLLOW AUGERS.

To all whom t may concern:

Be it known that I, ARcALoUs WYCKOEF, of Elmira, in the county of Ghemung and'State of N ew York, have invented a new and useful Improvement in Hollow Angers; and I do hereby declare that the following is a full, clear, and exact description of the same, reference heilig had to the annexed drawings, made a part of this specification, in which- Figure l is a perspective view, and Fig. 2 is a top view, of the annular cutter-head.

My improvement relates more particularly to that class ot' boring-machines in which a ring or series of concentric rings is cut out of a block ot' wood, each leaving an internal core and external shell. The difculty encountered in these tools when boring to considerable depth has been to give ready clearance to the cuttings. As the cutters must be wider on their faces than the space between the cylindrical stock and external shell by a little more than the thickness ot' the cylindrical stock, and as through the space between the stock and shell the cuttings must pass, the shavings being of the width of the cutters are liable to impede and stop the working` of the machine. This difficulty is not removed by reducing the feed, for the finer the shavings the greater their tendency to pack. The endl desired to be attained is to make the cuttings as thick as possible and as narrow. This has been attempted by means of alternately-reversed inclined cutters, each cutting one-half the width of the shaving; but such cutters producing wedgeshaped chips, they are found t0 be insuflicient to remedy the difculty, the thin portions of the shavin g producing the packing necessarily following the making of thin cuttings. To neet this diflicnlty I make my cutters as folows:

B represents the cylindrical ring constituting the cutter-head attached to the end ofthe cylinder of an auger ot' the above-described character.

A A are the cutters, spirally disposed upon the end of the cutter-head, having their projecting points made sharp. rIhese cutters have heretofore been made entire; but I divide them, so as to form two points, C and D and D and C', one. higher than the other and having the cutting-points O and D alternately projected, so that one cutter shall cut one-halt' the entire width ot' the kert', near the core, as at (l, No. l, and the succeeding cutter shall cut the halt' near the shell, as at l), No. 2, the feed being so regulated that the two points C and D or D and C of the same cutter A shall not cut at the same time, making a thick and a thin shaving.

By this means I am enabled to cut a uniformlythick shaving ofhalfthe ordinary width, which will be readily removed by the spiral flange of the hollow cylinder, and to make the shaving ot double the ordinary thickness, for

less power will, with this arrangement, allow double the feed attainable with angers ot' the ordinary construction of cutters.

Having fully explained the character of my improvements, what I claim as my invention, and seek to secure hy Letters Patent, is not, broadly, for an arrangement of cutting-bits for cutting with each alternate bit one-half the width ofthe kerf; but

I claim- The cutters A A, constructed with two or more alternately-projected cutting-points, O and D, so arranged as to cut in parallel but concentric planes, substantially in the manner and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARGALOUS WYGKOFF.

Witnesses JOHN S. HOLLINGSHEAD, L. A. MURPHY. 

